Initial try of integration tests

.gitlab-ci.yml

run_integration_tests.sh

src/common/tests/Assertions.py

src/context/tests/Dockerfile

src/context/tests/test_integration.py

src/device/tests/Dockerfile

src/device/tests/test_integration.py

src/integration_tester/.gitlab-ci.yml

src/integration_tester/Dockerfile

src/integration_tester/__init__.py

src/integration_tester/definitions.py

src/integration_tester/requirements.in

src/integration_tester/test_context_device.py